| Massage Envy* CT | — | 0 | — | — |
| Massage Retreat & Spa MN | — | 0 | — | — |
| MASSANA CONSTRUCTION INC. GA | Construction | 0 | — | F |
| Massanutten Resort - GERM Laundry VA | Accommodation & Food Services | 0 | — | F |
| MASSAPEQUA CENTER LLC NY | Healthcare & Social Assistance | 0 | — | F |
| Massar Capital Management, LP CT | Finance & Insurance | 1 | $170,000 | — |
| Massarelli's Lawn Ornaments, Inc. NJ | Manufacturing | 0 | — | F |
| Massaro PA | Construction | 0 | — | B |
| MassBiologics MA | — | 0 | — | — |
| MassBiologics of the UMass Chan Medical School MA | — | 0 | — | — |
| MassChallenge, Inc. MA | Finance & Insurance | 2 | $150,841 | — |
| Massconn Distributors CPL, Inc. CT | Manufacturing | 0 | — | F |
| Massena Electric Department NY | Utilities | 0 | — | A |
| Massena Hospital, Inc. NY | Healthcare & Social Assistance | 1 | $406,593 | — |
| Massett Building Company NJ | Construction | 0 | — | F |
| Massey Construction TN | Construction | 0 | — | F |
| Massey Electric, Inc TN | Construction | 0 | — | F |
| MASSEY HAULING CO., INC. AL | Transportation & Warehousing | 0 | — | A |
| MASSEY ROOFING SERVICES LLC FL | Construction | 0 | — | F |
| Massey Service, Inc. FL | Administrative & Waste Services | 0 | — | F |
| Massey Services Inc FL | Administrative & Waste Services | 0 | — | D |
| Massey Services Inc TX | Administrative & Waste Services | 0 | — | F |
| Massey Services Inc. LA | Administrative & Waste Services | 0 | — | A |
| Massey Services, Inc. GA | Administrative & Waste Services | 0 | — | C |
| Massey Services, Inc. NC | Administrative & Waste Services | 0 | — | A |
| Massey Services, Inc. OK | Administrative & Waste Services | 0 | — | F |
| Massey Services, Inc. SC | Administrative & Waste Services | 0 | — | F |
| Massey Services, Inc. TN | Administrative & Waste Services | 0 | — | A |
| Massey Services, Inc. VA | Administrative & Waste Services | 0 | — | A |
| Massey's Plate Glass and Aluminum CT | Construction | 0 | — | F |
| MassGrow LLC MA | Agriculture & Forestry | 0 | — | F |
| Massillon Container Company/Vail Industries OH | Manufacturing | 0 | — | F |
| Massillon Materials, Inc. OH | Mining & Extraction | 0 | — | D |
| Massimino Bldg LLC PA | Construction | 0 | — | A |
| Massively Parallel Technologies, Inc. AZ | Professional & Technical Services | 4 | $121,350 | — |
| Massivit 3D Inc. GA | Manufacturing | 1 | $90,000 | — |
| MassLight, Inc. DE | Professional & Technical Services | 1 | $176,800 | — |
| Massman Automation Designs MN | Manufacturing | 0 | — | B |
| Massman Companies, Inc. MN | Manufacturing | 0 | — | A |
| Massman Construction Company KS | Construction | 0 | — | B |
| Massman Construction Company OK | Construction | 0 | — | D |
| Masson Farms of New Mexico NM | Agriculture & Forestry | 0 | — | F |
| Massumi Consoli LLP CA | Professional & Technical Services | 2 | $390,000 | — |
| Mast & Brunk, Inc. VA | Construction | 0 | — | A |
| Mast Farm Service OH | Manufacturing | 0 | — | F |
| Mast Logistics Services, LLC OH | — | 0 | — | — |
| Mast Roofing & Construction, Inc. PA | Construction | 0 | — | A |
| MAST TECHNOLOGIES CA | Manufacturing | 0 | — | F |
| MAST Technology Services, Inc. OH | Retail Trade | 24 | $141,250 | — |
| Mast-Jaegermeister US, Inc. NY | Wholesale Trade | 1 | $110,000 | — |
